feat(framework): Support Next.js 15 with Turbopack dev server

[rifont]

What changed? Why was the change needed?

• Support Next.js 15 with Turbopack dev server
  • Removes use of node built-in modules to support Edge runtime environments. Replacements are:
  • hand-rolled isNativeError replacing the built-in node:util/types isNativeError
  • WebCrypto implementation of HMAC validation using crypto.subtle replacing the built-in node:crypto createHmac

Screenshots

Testing with Next.js 15.0.3-canary.9

> next dev --turbopack --port 4000

   ▲ Next.js 15.0.3-canary.9 (Turbopack)
   - Local:        http://localhost:4000
   - Environments: .env.local

 ✓ Starting...
 ✓ Ready in 763ms
 ○ Compiling /api/novu ...
 ✓ Compiled /api/novu in 983ms

Discovered workflowId: 'welcome-onboarding-2'
└ σ Discovered stepId: 'send-in-app'    Type: 'in_app'
 GET /api/novu?action=discover 200 in 1221ms

Expand for optional sections

### Related enterprise PR ### Special notes for your reviewer

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